On June 6, 2015, during a review of Independent Spent Fuel Storage (
ISFSI) cask loading, plant personnel discovered that for two casks, preferential loading was not used during uniform loading as required by
ISFSI Technical Specification 2.1.2, Uniform and Preferential Fuel Loading.
ISFSI Technical Specification 2.1.2 requires that a preferential fuel loading configuration (i.e., that fuel assemblies with the longest cooling times shall be loaded into peripheral fuel storage locations) is used during uniform loading. Preferential loading was only partially met for two casks, designated MPC-253 and MPC-257. For these two casks, fuel assemblies with the longest cooling times were placed in the four center cask locations, which are only ones allowed for those assemblies containing control rods.
Engineering has performed an evaluation and determined that the fuel casks remain in a safe and analyzed condition.'
There is no adverse effect on the health and safety of the public.
The NRC Resident Inspector has been informed.
- * * UPDATE FROM WESLEY FIANT TO DONALD NORWOOD AT 2100 EDT ON 6/9/2015 * * *
A full extent of condition review has determined that 17 of the 29 loaded casks in the Diablo Canyon ISFSI prior to the 2015 campaign were found to be out of compliance with ISFSI Technical Specification 2.1.2, Uniform and Preferential Fuel Loading. The casks were preferentially loaded based on heat load vs cooling time.
Engineering has performed an evaluation and determined that the fuel and casks remains in a safe and analyzed condition.
There is no adverse effect on the health and safety of the public.
The NRC Senior Resident Inspector has been informed.
Notified R4DO (Werner).